平面潮流数值模拟中底床摩阻系数的修正

本文从三维潮流运动控制方程出发，假定潮流垂直分布服从对数律，推得了一个较全面反映水深、水位变化梯度和流向等因素的摩阻系数修正表达式，理论分析和应用表明，运用修正后的摩阻系数，平面二维潮流数值模型更为完善，并能适用于陡变地形，从而使复演模拟和工程计算结果更为科学合理。

A correction of formula for bed resistance coefficient in numerical simulation of plane tidal current

By means of a logarithm law for the velocity profile, a corrected formula of bed resistance coefficient, which involves many factors such as the gradient of still water depth, the variation of surface elevation, the flow direction and so on, was derived from the 3D governing equations of tidal current by averaging over the whole water depth. Theoretical analysis and application show that the 2D plane tidal current numerical model would be more reasonable and could be applied to steeper bottom topography when the corrected bed resistance coefficient is used, therefore the results of reproduction simulation and engineering calculation would be more reasonable.